Nani Kore is a common Japanese phrase rather than a line tied to one single anime, character or scene, which is why it works so well as a standalone reaction sound. It has circulated widely on soundboards and short-form video platforms, where creators reuse short anime reaction sounds for confusion, curiosity and comic surprise. Its brevity makes it easy to drop into memes, edits and livestream moments without explaining the joke, and its clear questioning tone keeps it recognisable even to viewers who do not speak Japanese.